Abstract
Abstract. This document aims to validate the workflow from a digital survey of a residential building of the early 900 century of historical value ready for future renovation to the transformation into a BIM model for its holographic fruition augmented by an automatically extraction of data and information contained within. Via Lulli is a low-cost residential district organized in courtyard blocks subject of future energy saving interventions; the research topic concerns the validation of the workflow from the 3D digital survey to the holographic visualization augmented with automatic extraction of information using the innovative Euclideon Hologram Table©.The possibility of interrogating an informative 3D BIM model visualized in a 3D space in front of the operator and not simply through a desktop is a completely new field in research with many potentialities; in the specific case study the abundance of these heritage buildings in the city must be considered as a relevant data to organize their whole renovation. After the previous validation of transforming the 3D BIM model to hologram, analysing the file formats, technical performance and specifications, file dimensions manageable, the successive implementation has been focused on the automatism of extraction of the different useful information from the model. The possibility of interacting to query the model in holographic representation represents an extraordinary tool for managing BIM which opens new research; it has been reached through tests for interoperability among formats, necessity of transformation of the BIM model without losing information and accuracy, friendly fruition in the Euclideon Hologram Table©.
Highlights
Digital survey and modelling techniques have progressed during the last years, both in terms of accuracy, data management and resolution due to hardware and software developments; in spite of this their visualization has always been performed in the same way through classical reduction in a 2D surface such as a screen
After a slow beginning where holograms were associated with the optical process of reproducing 2D images with a certain depth used as static images in their current version they have begun to refer to a 3D digital volume, supported by the concept of Voxel instead of Pixel, providing navigable virtual reproduction of the projected objects
The survey was set up with a high-speed time-of-flight scanner, RTC 360 characterized by scans of 2 million points per second with simultaneous capture of spherical HDR (High Dynamic Range) images. It features Visual Inertial System (VIS) technology that automatically tracks the movement of the scanner, enabling semi-automatic data recording in the field without targets; the related project is registered in local coordinate system (Figure 2)
Summary
Digital survey and modelling techniques have progressed during the last years, both in terms of accuracy, data management and resolution due to hardware and software developments; in spite of this their visualization has always been performed in the same way through classical reduction in a 2D surface such as a screen. After a slow beginning where holograms were associated with the optical process of reproducing 2D images with a certain depth used as static images in their current version they have begun to refer to a 3D digital volume, supported by the concept of Voxel instead of Pixel, providing navigable virtual reproduction of the projected objects This development of the first experiments follows the radical improvement of mathematical algorithms, largely aided by the improved computing capabilities of PCs, and of the interference, called cross-talk (Makey, 2019), previously too noisy between the large number of two-dimensional images assembled to create a three-dimensional effect. The use of holography connected to the field of augmented reality (Gao,2019) has grown exponentially in recent years, driven by the need for applications in industrial and medical fields (Fraga-Lamas 2018; Brun 2019; Desselle 2020)
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